CN216267379U

CN216267379U - Hot nozzle assembly and hot runner system

Info

Publication number: CN216267379U
Application number: CN202122733873.1U
Authority: CN
Inventors: 李象烈
Original assignee: Yudo Suzhou Hot Runner Systems Co Ltd
Current assignee: Yudo Suzhou Hot Runner Systems Co Ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-04-12
Anticipated expiration: 2031-11-09

Abstract

The utility model discloses a hot nozzle assembly and a hot runner system, wherein the hot nozzle assembly comprises a hot nozzle extending along a longitudinal axis, a valve needle and a nozzle tip positioned on the inner side of the hot nozzle, the hot nozzle defines a first flow passage, the nozzle tip defines a second flow passage communicated with the first flow passage and a pouring gate communicated with the second flow passage, the valve needle is movably arranged in the first flow passage and the second flow passage along the longitudinal axis to open or close the pouring gate, the hot nozzle assembly also comprises a pressing cap fixedly connected with the hot nozzle, and the nozzle tip is embedded on the inner side of the pressing cap and forms a whole with the pressing cap. The technical scheme provided by the utility model ensures the coaxiality of the valve needle and the pouring gate, and avoids glue leakage between the nozzle tip and the pressing cap.

Description

Hot nozzle assembly and hot runner system

Technical Field

The utility model relates to the field of hot runner molds, in particular to a hot nozzle assembly and a hot runner system.

Background

The hot nozzle assembly generally includes a hot nozzle, a nozzle tip disposed in the hot nozzle, and a valve pin, wherein the valve pin is driven to reciprocate in a flow channel formed by the hot nozzle and the nozzle tip, so as to open or close a gate formed on the nozzle tip for injecting glue or stopping injecting glue. The hot nozzle assembly further comprises a pressing cap in threaded connection with the hot nozzle, the nozzle tip is located on the inner side of the pressing cap and in clearance fit with the pressing cap, the nozzle tip is tightly pressed on the hot nozzle by the upper end face of the pressing cap, and the size tolerance between the inner hole of the nozzle tip and the outer diameter of the pressing cap is mainly determined by the independent machining process of the nozzle tip and the pressing cap. The specific installation process is that the nozzle tip is firstly arranged on the inner side of the hot nozzle, the pressing cap is arranged between the nozzle tip and the hot nozzle, and the pressing cap is fixed on the hot nozzle through threads, so that the nozzle tip is pressed on the hot nozzle. In addition, after long-term use, the deformation of the nozzle tip can lead to the loosening of the thread of the pressing cap, thereby causing glue leakage.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a hot nozzle component and a hot runner system, which ensure the coaxiality of a valve needle and a pouring gate and avoid glue leakage between a nozzle tip and a pressing cap.

In order to achieve one of the above objects of the present invention, an embodiment of the present invention provides a hot nozzle assembly including a hot nozzle extending along a longitudinal axis, the hot nozzle defining a first flow passage, a valve pin, and a tip located inside the hot nozzle, the tip defining a second flow passage communicating with the first flow passage and a gate communicating with the second flow passage, the valve pin being movably disposed in the first flow passage and the second flow passage along the longitudinal axis to open or close the gate, wherein,

the hot nozzle component also comprises a pressing cap fixedly connected with the hot nozzle, and the nozzle tip is embedded in the inner side of the pressing cap and integrated with the pressing cap.

As a further improvement of an embodiment of the present invention, the tip has a lower structural portion and an upper structural portion protruding from an outer periphery of the lower structural portion, the upper structural portion is in interference fit with the press cap, and part of the lower structural portion is in clearance fit with the press cap.

As a further improvement of an embodiment of the present invention, the press cap has an inwardly projecting inner projection abutting the upper structure portion in an axial direction parallel to the longitudinal axis.

As a further improvement of an embodiment of the present invention, the upper end of the tip and the upper end of the pressing cap are flush, and both the upper end of the tip and the upper end of the pressing cap abut the hot nozzle in an axial direction parallel to the longitudinal axis.

As a further improvement of an embodiment of the present invention, the press cap has an outwardly projecting outward projection which abuts against a lower end of the hot nozzle in an axial direction parallel to the longitudinal axis.

As a further refinement of an embodiment of the present invention, the hot nozzle assembly further includes an insulating cap having an abutment surface for abutting a lower extremity of the nozzle tip, the abutment surface being perpendicular to the longitudinal axis.

As a further improvement of an embodiment of the present invention, the tip includes an upper tip portion that is in contact with the pressure cap and a lower tip portion that defines the gate, the upper tip portion defines a second flow passage, the lower tip portion has a hardness that is greater than a hardness of the upper tip portion, the lower tip portion has a thermal conductivity that is less than a thermal conductivity of the upper tip portion, and the upper tip portion and the lower tip portion are integrally provided undetachably.

In order to achieve one of the above objects of the present invention, there is provided a hot runner system including a hot nozzle assembly for pouring plastic in a molten state, the hot nozzle assembly including a hot nozzle extending along a longitudinal axis, a valve pin, and a nozzle tip located inside the hot nozzle, the hot nozzle defining a first flow passage, the nozzle tip defining a second flow passage communicating with the first flow passage and a gate communicating with the second flow passage, the valve pin being movably disposed in the first and second flow passages along the longitudinal axis to open or close the gate, the hot runner system including a hot nozzle assembly for pouring plastic in a molten state,

Compared with the prior art, the utility model has the beneficial effects that: the nozzle tip is embedded in the inner side of the pressing cap and is integrated with the pressing cap, namely, the nozzle tip is in interference fit in the pressing cap, and the nozzle tip and the pressing cap form a whole together, so that the relative tolerance between the nozzle tip and the pressing cap is fixed and unchanged, and the coaxiality of the valve needle and the pouring gate is ensured; in addition, the pressure cap is prevented from loosening due to the deformation of the nozzle tip, so that the glue leakage between the nozzle tip and the pressure cap is avoided.

Drawings

FIG. 1 is a schematic longitudinal sectional view of a hot nozzle assembly according to an embodiment of the present invention;

fig. 2 is a schematic longitudinal sectional view of a hot nozzle assembly according to an embodiment of the present invention, with the valve needle removed.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

In the description of the embodiments of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are generally referred to in a normal mounting state of the hot nozzle assembly, and do not indicate that the indicated positions or elements must have specific orientations.

As shown in fig. 1 and 2, a preferred embodiment of the hot nozzle assembly of the present invention provides a hot runner system, which includes a hot nozzle assembly, a temperature control box and a hot runner formed at least in the hot nozzle assembly, and plastic in a molten state is sequentially poured into a cavity of a mold through the hot nozzle assembly by means of heating and temperature controlling the plastic injection material, so as to avoid forming a solidified material in the pouring system.

Specifically, the hot nozzle assembly 10 is used for casting plastic in a molten state, and the hot nozzle assembly 10 includes a hot nozzle 14 extending along a longitudinal axis 12, a valve pin 15, and a nozzle tip 16 located inside the hot nozzle 14. The hot runner system further includes a driving unit (not shown) for driving the valve pin 15 to reciprocate along the longitudinal axis 12, the hot nozzle 14 and the nozzle tip 16 are both provided in a hollow structure, the hot nozzle 14 defines a first flow passage 18, the nozzle tip 16 defines a second flow passage 20 communicating with the first flow passage 18 and a gate 22 communicating with the second flow passage 20, and the valve pin 15 is drivingly movable in the first flow passage 18 and the second flow passage 20 in an extending direction of the longitudinal axis 12 to open or close the gate 22. The hot nozzle assembly 10 further includes a pressing cap 24 fixedly connected to the hot nozzle 14, and the nozzle tip 16 is embedded inside the pressing cap 24 and is integrated with the pressing cap 24.

In the preferred embodiment, since the tip 16 is embedded inside the pressing cap 24 and integrated with the pressing cap 24, that is, the tip 16 is interference-fitted into the pressing cap 24, and the tip 16 and the pressing cap 24 are integrated together, the relative tolerance between the tip 16 and the pressing cap 24 is ensured to be constant, and the coaxiality of the valve pin 15 and the gate 22 is ensured; in addition, the nozzle tip 16 is prevented from being deformed to cause the pressing cap 24 to be loosened, so that glue leakage between the nozzle tip 16 and the pressing cap 24 is avoided.

In the present embodiment, the nozzle assembly 10 has a central axis, and for clarity of location and orientation described in the present application, reference is generally made to upstream and downstream of the hot runner in the nozzle assembly 10, and the direction from upstream to downstream of the hot runner along the central axis is defined as "lower" and vice versa as "upper". The molding material first enters the first flow path 18 defined by the hot nozzle 14, then flows down the second flow path 20, and finally flows out of the gate 22 and is injected into the cavity of the mold for casting. When the pouring is stopped, the valve pin 15 is driven to move downward to close the gate 22. In the preferred embodiment, the gate 22 is disposed coaxially with the first and

second flow passages

18, 20. Of course, the extension axis of the gate 22 may be arranged to form an angle with the extension axes of the first flow channel 18 and the second flow channel 20, and in this case, the gate 22 may be arranged to be one, or two or more.

Specifically, the tip 16 has a lower structural portion 26 and an upper structural portion 28 protruding from the outer periphery of the lower structural portion 26 and located above the lower structural portion 26, the upper structural portion 28 is in interference fit with the pressing cap 24, and a part of the lower structural portion 26 is in clearance fit with the pressing cap 24.

Further, the upper end of the tip 16 and the upper end of the gland 24 are flush, and both the upper end of the tip 16 and the upper end of the gland 24 abut the hot tip 14 in an axial direction parallel to the longitudinal axis 12. In a circumferential direction perpendicular to the longitudinal axis 12, the tip 16 is remote from the hot nozzle 14, i.e. in a circumferential direction perpendicular to the longitudinal axis 12, the tip 16 is not in contact with the hot nozzle 14.

In the preferred embodiment, the press cap 24 is fixedly attached to the inside of the hot nozzle 14 by threads. Since the nozzle tip 16 and the pressing cap 24 are formed as an integral structural member, the nozzle tip 16 and the pressing cap 24 are fixedly connected together to the inner side of the hot nozzle 14 by screw threads, the pressing cap 24 is usually made of grinding tool steel, and of course, the pressing cap 24 may be made of other materials.

The press cap 24 has an inwardly projecting internal projection 30, the internal projection 30 abutting the upper formation 28 in an axial direction parallel to the longitudinal axis 12. This arrangement ensures a relative positional relationship between the tip 16 and the cap 24 in an axial direction parallel to the longitudinal axis 12.

The press cap 24 has an outwardly projecting outward projection 32 which abuts the lower end of the hot nozzle 14 in an axial direction parallel to the longitudinal axis 12. Thereby ensuring the stability of the installation of the press cap 24.

In addition, the hot nozzle assembly 10 further includes an insulating cap 34, the insulating cap 34 having an abutment surface against the lower end of the nozzle tip 16, the abutment surface being perpendicular to the longitudinal axis 12.

Further, the tip 16 includes an upper tip portion 36 contacting the pressure cap 24 and a lower tip portion 38 defining the gate 22, the upper tip portion 36 defining the second flow passage 20, the lower tip portion 38 having a hardness greater than that of the upper tip portion 36, the lower tip portion 38 having a thermal conductivity less than that of the upper tip portion 36, the upper tip portion 36 and the lower tip portion 38 being integrally provided undetachably.

In the preferred embodiment, because the upper tip 36 and the lower tip 38 are made of different materials, the hardness of the lower tip 38 is greater than that of the upper tip 36, and the thermal conductivity of the lower tip 38 is less than that of the upper tip 36. The upper nozzle tip portion 36 is made to perform heat transfer, and fluidity of the molten material is ensured, while the needle 15 hits the lower nozzle tip portion 38 when moving downward, and the hardness of the lower nozzle tip portion 38 is made greater, so that the nozzle tip 16 is not easily worn and deformed. In addition, in the preferred embodiment, the lower structural portion 26 is formed by a lower mouth tip portion 38 and a portion of the upper mouth tip portion 36, and the upper structural portion 28 is formed by another portion of the upper mouth tip portion 36.

Further, the upper nozzle tip portion 36 and the lower nozzle tip portion 38 are integrated by 3D printing. Of course, the upper and

lower tips

36 and 38 may be integrally formed by welding. The upper and

lower beak portions

36 and 38 may be integrally provided together by adhesion or the like.

The upper end surface of the lower spout tip 38 is perpendicular to the longitudinal axis 12, and the upper end surface of the lower spout tip 38 defines a plane that is distal from the thermal cap 34.

Further, the lower mouth tip 38 is distal from the gland 24. The lower spout tip 38 is not in contact with the gland 24. Specifically, in a circumferential direction perpendicular to the longitudinal axis 12, the lower tip portion 38 has a clearance with the cap 24 that ensures the overall temperature of the tip 16 and reduces heat transfer to the cap 24.

In the preferred embodiment, the lower nose portion 38 is made of a harder steel material, although other types of harder materials may be used for the lower nose portion 38. The upper nose portion 36 is made of copper having a high thermal conductivity, but the upper nose portion 36 may be made of other materials having a high thermal conductivity.

The present invention also provides a method of assembling a hot nozzle assembly 10, the method comprising the steps of:

a. embedding the nozzle tip 16 in the inner side of the press cap 24, so that the nozzle tip 16 and the press cap 24 form a whole;

b. the integral piece of the tip 16 and the cap 24 is installed in the hot nozzle 14 such that the second flow passage 20 is in communication with the first flow passage 18.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A hot nozzle assembly comprising a hot nozzle extending along a longitudinal axis, a valve pin, and a tip located inside the hot nozzle, the hot nozzle defining a first flow passage, the tip defining a second flow passage in communication with the first flow passage and a gate in communication with the second flow passage, the valve pin being movably disposed within the first and second flow passages along the longitudinal axis to open or close the gate,

2. The hot nozzle assembly of claim 1, wherein the tip has a lower structural portion and an upper structural portion protruding from an outer periphery of the lower structural portion, the upper structural portion being in interference fit with the cap, and a portion of the lower structural portion being in clearance fit with the cap.

3. A hot nozzle assembly according to claim 2, wherein said compression cap has an inwardly projecting internal projection that abuts said upper structure in an axial direction parallel to the longitudinal axis.

4. A hot nozzle assembly as claimed in claim 1, wherein said upper tip end of said tip and said upper cap end are flush, and wherein said upper tip end of said tip and said upper cap end abut said hot nozzle in an axial direction parallel to said longitudinal axis.

5. A hot nozzle assembly according to claim 1, wherein said pressing cap has an outwardly projecting outward projection that abuts a lower tip of said hot nozzle in an axial direction parallel to the longitudinal axis.

6. The hot nozzle assembly of claim 1, further comprising an insulating cap having an abutment surface that abuts a lower tip of the nozzle tip, the abutment surface being perpendicular to the longitudinal axis.

7. The hot nozzle assembly as claimed in claim 1, wherein said tip includes an upper tip portion in contact with said cap and a lower tip portion defining said gate, said upper tip portion defining a second flow path, said lower tip portion having a hardness greater than a hardness of said upper tip portion, said lower tip portion having a thermal conductivity less than a thermal conductivity of said upper tip portion, said upper and lower tip portions being integrally non-detachably disposed.

8. A hot-runner system comprising a hot-nozzle assembly for pouring a plastic in a molten state, the hot-nozzle assembly comprising a hot nozzle extending along a longitudinal axis, a valve pin, and a tip located inside the hot nozzle, the hot nozzle defining a first flow passage, the tip defining a second flow passage in communication with the first flow passage and a gate in communication with the second flow passage, the valve pin being movably disposed within the first and second flow passages along the longitudinal axis to open or close the gate,

9. The hot-runner system of claim 8, wherein an upper end of the tip and an upper end of the gland are flush, and wherein the upper end of the tip and the upper end of the gland abut the hot nozzle in an axial direction parallel to the longitudinal axis.